6FD7
Dual Triode · IHT · 9-pin Noval · 1960
“Dissimilar dual. High/low mu one-tube amp.”
Power triode delivering 10W for push-pull and SET designs
GAIN FACTOR0
PLATE IMPEDANCE0Ω
TRANSCONDUCTANCE0mA/V
GAIN66%
POWER25%
DRIVE99%
LINEARITY67%
EXECUTIVE SUMMARY
The 6FD7 is a dual indirectly-heated triode from Sylvania·RCA, introduced around 1960. It provides a gain factor (μ) of 66 with 750Ω plate resistance. Commonly used in driver + power applications. Dissimilar dual. High/low mu one-tube amp.
APPLICATIONS
SET outputPush-pull outputHeadphone outputHigh-gain preampPhase splitter
Generic triode driver + power stage
• Hi-Fi stereo• Headphone amp• Studio/recording
HISTORY
Introduced1960ManufacturerSylvania·RCAEquivalents13FD7
Late ProductionSPECIFICATIONS
Heater Voltage6.3V
Heater Current1.2A
Max Plate Voltage400V
Max Power10W
Sensitivity7 mA/V
Gain Factor66
Internal Impedance750Ω
Pinout9-pin Noval
Era1960
RarityModerate
SPICE model not yet available. Loadline calculator requires calibrated Koren parameters.